Android Question How to save image in File.DirRootExternal and retrieve it

        'ImageView1.SetBackgroundImage(BytesToImage(ktv))
                            ImageView1.SetBitmap(CreateRoundBitmap(Base64StringToImage(ktb), ImageView1.Width))
                   
                        '    SavePhoto(Base64StringToImage(ktb))

Sub SavePhoto (Pt As Bitmap,NewFile As String)
    Dim Out As OutputStream
    Out = File.OpenOutput(File.DirRootExternal, NewFile, False)
    Pt.WriteToStream(Out, 100, "PNG")
    Out.Close
End Sub